$ git clone -n https://src.fedoraproject.org/rpms/copr-backend.git /var/lib/mock/f41-build-side-1-3133765-39700/root/chroot_tmpdir/scmroot/copr-backend
Cloning into '/var/lib/mock/f41-build-side-1-3133765-39700/root/chroot_tmpdir/scmroot/copr-backend'...
$ git fetch origin 364ad3806817e6f7e0877d8f324b86382fbb5a44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/copr-backend
 * [new ref]         364ad3806817e6f7e0877d8f324b86382fbb5a44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 364ad38 Update copr-backend to 2.1-1